QUANTITATIVE ESTIMATION OF BACTERIOTROPINS 209 



criminate manufacture and use of vaccines have brought this valuable 

 field of therapy inevitably into disrepute. This is being realized more 

 and more, and the effort is being made to restore the value of this form 

 of therapy. This effort consists in recognizing the possibilities and 

 limitations of the method, and confining its practice to those who possess, 

 at least, sufficient knowledge of bacteriology to prepare a vaccine and 

 make an opsonic measurement, the best results being secured by co- 

 operation between bacteriologist and clinician. 

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